XCode 4.5.1 AudioQueue & linker命令失败

Question

我会尽我所能。我会用我的录音队列录制一个声音。我有一个项目，并添加了我的项目所需的所有框架(所以这不是问题)。我只更改了两个文件：

• ViewController.h
• ViewController.m

在开始之前:我不确定文件类型(void)或(IBAction)(我无法测试它)。

这是我的ViewController.h的源代码

#import <UIKit/UIKit.h>
//#import <AudioToolbox/AudioQueue.h>  //(don't know to use that) 
//#import <AudioToolbox/AudioFile.h>   //(don't know to use that)
#import <AudioUnit/AudioUnit.h>
#import <AudioToolbox/AudioToolbox.h>

#define NUM_BUFFERS 3
#define SECONDS_TO_RECORD 10

typedef struct
{
    AudioStreamBasicDescription  dataFormat;
    AudioQueueRef                queue;
    AudioQueueBufferRef          buffers[NUM_BUFFERS];
    AudioFileID                  audioFile;
    SInt64                       currentPacket;
    bool                         recording;
} RecordState;

typedef struct
{
    AudioStreamBasicDescription  dataFormat;
    AudioQueueRef                queue;
    AudioQueueBufferRef          buffers[NUM_BUFFERS];
    AudioFileID                  audioFile;
    SInt64                       currentPacket;
    bool                         playing;
} PlayState;



@interface ViewController : UIViewController{
    IBOutlet UILabel* labelStatus;
    IBOutlet UIButton* buttonRecord;
    IBOutlet UIButton* buttonPlay;
    RecordState recordState;
    PlayState playState;
    CFURLRef fileURL;
}

- (BOOL)getFilename:(char*)buffer maxLenth:(int)maxBufferLength;
- (void)setupAudioFormat:(AudioStreamBasicDescription*)format;
- (void)recordPressed:(id)sender;
- (void)playPressed:(id)sender;
- (IBAction)startRecording;
- (IBAction)stopRecording;
- (IBAction)startPlayback;
- (IBAction)stopPlayback;

这是我的ViewController.m的源代码

(我在funktion startPlayback注释中出现了一个错误)

#import "ViewController.h"
@interface ViewController ()
@end

@implementation ViewController

void AudioInputCallback(
                    void *inUserData,
                    AudioQueueRef inAQ,
                    AudioQueueBufferRef inBuffer,
                    const AudioTimeStamp *inStartTime,
                    UInt32 inNumberPacketDescriptions,
                    const AudioStreamPacketDescription *inPacketDescs)
{

    RecordState* recordState = (RecordState*)inUserData;

    if(!recordState->recording)
    {
        printf("Not recording, returning\n");
    }

    //if(inNumberPacketDescriptions == 0 && recordState->dataFormat.mBytesPerPacket != 0)
    //{
    //    inNumberPacketDescriptions = inBuffer->mAudioDataByteSize / recordState->dataFormat.mBytesPerPacket;
    //}

    printf("Writing buffer %lld\n", recordState->currentPacket);
    OSStatus status = AudioFileWritePackets(recordState->audioFile,
                                        false,
                                        inBuffer->mAudioDataByteSize,
                                        inPacketDescs,
                                        recordState->currentPacket,
                                        &inNumberPacketDescriptions,
                                        inBuffer->mAudioData);
    if(status == 0)
    {
        recordState->currentPacket += inNumberPacketDescriptions;
    }

    AudioQueueEnqueueBuffer(recordState->queue, inBuffer, 0, NULL);
}

void AudioOutputCallback(
                     void* inUserData,
                     AudioQueueRef outAQ,
                     AudioQueueBufferRef outBuffer)
{
    PlayState* playState = (PlayState*)inUserData;
    if(!playState->playing)
    {
        printf("Not playing, returning\n");
        return;
    }

    printf("Queuing buffer %lld for playback\n", playState->currentPacket);

    AudioStreamPacketDescription* packetDescs = NULL;

    UInt32 bytesRead;
    UInt32 numPackets = 8000;
    OSStatus status;
    status = AudioFileReadPackets(
                              playState->audioFile,
                              false,
                              &bytesRead,
                              packetDescs,
                              playState->currentPacket,
                              &numPackets,
                              outBuffer->mAudioData);

    if(numPackets)
    {
        outBuffer->mAudioDataByteSize = bytesRead;
        status = AudioQueueEnqueueBuffer(
                                     playState->queue,
                                     outBuffer,
                                     0,
                                     packetDescs);

        playState->currentPacket += numPackets;
    }
    else
    {
        if(playState->playing)
        {
            AudioQueueStop(playState->queue, false);
            AudioFileClose(playState->audioFile);
            playState->playing = false;
        }

        AudioQueueFreeBuffer(playState->queue, outBuffer);
    }    
}

- (void)setupAudioFormat:(AudioStreamBasicDescription*)format
{
    format->mSampleRate = 8000.0;
    format->mFormatID = kAudioFormatLinearPCM;
    format->mFramesPerPacket = 1;
    format->mChannelsPerFrame = 1;
    format->mBytesPerFrame = 2;
    format->mBytesPerPacket = 2;
    format->mBitsPerChannel = 16;
    format->mReserved = 0;
    format->mFormatFlags = kLinearPCMFormatFlagIsBigEndian |
    kLinearPCMFormatFlagIsSignedInteger |
    kLinearPCMFormatFlagIsPacked;
}

- (void)recordPressed:(id)sender
{
    if(!playState.playing)
    {
        if(!recordState.recording)
        {
            printf("Starting recording\n");
            [self startRecording];
        }
        else
        {
            printf("Stopping recording\n");
            [self stopRecording];
        }
    }
    else
    {
        printf("Can't start recording, currently playing\n");
    }
}

- (void)playPressed:(id)sender
{
    if(!recordState.recording)
    {
        if(!playState.playing)
        {
            printf("Starting playback\n");
            [self startPlayback];
        }
        else
        {
            printf("Stopping playback\n");
            [self stopPlayback];
        }
    }
}

- (IBAction)startRecording
{
    [self setupAudioFormat:&recordState.dataFormat];

    recordState.currentPacket = 0;

    OSStatus status;
    status = AudioQueueNewInput(&recordState.dataFormat,
                                AudioInputCallback,
                                &recordState,
                                CFRunLoopGetCurrent(),
                                kCFRunLoopCommonModes,
                                0,
                                &recordState.queue);

    if(status == 0)
    {
        for(int i = 0; i < NUM_BUFFERS; i++)
        {
            AudioQueueAllocateBuffer(recordState.queue,
                                     16000, &recordState.buffers[i]);
            AudioQueueEnqueueBuffer(recordState.queue,
                                    recordState.buffers[i], 0, NULL);
        }

        status = AudioFileCreateWithURL(fileURL,
                                        kAudioFileAIFFType,
                                        &recordState.dataFormat,
                                        kAudioFileFlags_EraseFile,
                                        &recordState.audioFile);
        if(status == 0)
        {
            recordState.recording = true;
            status = AudioQueueStart(recordState.queue, NULL);
            if(status == 0)
            {
                labelStatus.text = @"Recording";
            }
        }
    }

    if(status != 0)
    {
        [self stopRecording];
        labelStatus.text = @"Record Failed";
    }
}

- (IBAction)stopRecording
{
    recordState.recording = false;

    AudioQueueStop(recordState.queue, true);
    for(int i = 0; i < NUM_BUFFERS; i++)
    {
        AudioQueueFreeBuffer(recordState.queue,
                             recordState.buffers[i]);
    }

    AudioQueueDispose(recordState.queue, true);
    AudioFileClose(recordState.audioFile);
    labelStatus.text = @"Idle";
}

- (IBAction)startPlayback
{
    playState.currentPacket = 0;

    [self setupAudioFormat:&playState.dataFormat];

    OSStatus status;


    // I get here an error
    // Use of undeclared identifier 'fsRdPerm'
    // How to fix that?
    status = AudioFileOpenURL(fileURL, fsRdPerm, kAudioFileAIFFType, &playState.audioFile);


    if(status == 0)
    {
        status = AudioQueueNewOutput(
                                     &playState.dataFormat,
                                     AudioOutputCallback,
                                     &playState,
                                     CFRunLoopGetCurrent(),
                                     kCFRunLoopCommonModes,
                                     0,
                                     &playState.queue);

        if(status == 0)
        {
            playState.playing = true;
            for(int i = 0; i < NUM_BUFFERS && playState.playing; i++)
            {
                if(playState.playing)
                {
                    AudioQueueAllocateBuffer(playState.queue, 16000, &playState.buffers[i]);
                    AudioOutputCallback(&playState, playState.queue, playState.buffers[i]);
                }
            }

            if(playState.playing)
            {
                status = AudioQueueStart(playState.queue, NULL);
                if(status == 0)
                {
                    labelStatus.text = @"Playing";
                }
            }
        }
    }

    if(status != 0)
    {
        [self stopPlayback];
        labelStatus.text = @"Play failed";
    }
}

- (void)stopPlayback
{
    playState.playing = false;

    for(int i = 0; i < NUM_BUFFERS; i++)
    {
        AudioQueueFreeBuffer(playState.queue, playState.buffers[i]);
    }

    AudioQueueDispose(playState.queue, true);
    AudioFileClose(playState.audioFile);
}

- (BOOL)getFilename:(char*)buffer maxLenth:(int)maxBufferLength
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                         NSUserDomainMask, YES);
    NSString* docDir = [paths objectAtIndex:0];
    NSString* file = [docDir stringByAppendingString:@"/recording.aif"];
    return [file getCString:buffer maxLength:maxBufferLength encoding:NSUTF8StringEncoding];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
}

@end

我不知道如何解决这个问题，我可以用我的项目。如果我将funktion startPlayback注释掉，就会得到以下错误：

Ld /Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Products/Debug-iphonesimulator/recorder_test2.app/recorder_test2普通i386光盘/用户/名称/桌面/记录器_i386 2 setenv IPHONEOS_DEPLOYMENT_TARGET 6.0 setenv路径"/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr//Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot -filelist/Users/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Intermediates/recorder_test2.build/Debug-iphonesimulator/recorder_test2.build/Objects-normal/i386/recorder_test2.LinkFileList -Xlinker -objc_abi_version -Xlinker 2-fobjc-弧形-fobjc-链接-运行时-Xlinker -no_implicit_dylibs -mios-模拟器-版本-min=6.0 -framework AudioToolbox -framework AudioUnit -framework -framework UIKit -framework Foundation -framework CoreGraphics -framework/User/NAME/Library/Developer/Xcode/DerivedData/recorder_test2-gehymgoneospsldgfpxnbjdapebu/Build/Products/Debug-iphonesimulator/recorder_test2.app/recorder_test2 ld:框架未找到AudioUnit clang: error: linker命令失败，退出代码1(使用-v查看调用)

请使用这两个源文件，并测试它自己和帮助我。

Answer 1

只需在项目设置中添加AudioUnit并确保有正确的路径即可。

​

​

Answer 2

从项目中删除AudioUnit.framework并将fsRdPerm替换为kAudioFileReadPermission。

说来话长：

虽然经过一段时间的谷歌之旅，我找不到任何证据，但我几乎可以肯定，fsRdPerm不再存在于iOS 6的任何音频框架中。我在iOS6模拟器中搜索过它，它只出现在CarbonCore.framework中，这是一个遗留的框架，因此很古老：

pwds2622:Frameworks mac$ pwd
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/Frameworks
s2622:Frameworks mac$ grep -sr fsRdPerm .
./CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Frameworks/CarbonCore.framework/Versions/A/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Frameworks/CarbonCore.framework/Versions/Current/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/Current/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Versions/Current/Frameworks/CarbonCore.framework/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Versions/Current/Frameworks/CarbonCore.framework/Versions/A/Headers/Files.h:  fsRdPerm                      = 0x01,
./CoreServices.framework/Versions/Current/Frameworks/CarbonCore.framework/Versions/Current/Headers/Files.h:  fsRdPerm                      = 0x01,

我发现论坛上的帖子建议使用kAudioFileReadPermission而不是fsRdPerm。这是可行的，实际上，kAudioFileReadPermission的文档说这是“AudioFileOpenURL和AudioFileOpen函数使用的标志”之一。在音频文件权限标志阅读更多内容。